Word limit on user biography

app/models/user.rb

@@ -54,14 +54,8 @@ class User < ActiveRecord::Base
             },
             presence: true
 
-  ##
+  validate :check_biography_length
-  # Checkes if the user attended the event
+  
-  # This is used for events that require registration
-  # The user must have registered to attend the event
-  # Gets an event
-  # === Returns
-  # * +true+ if the user attended the event
-  # * +false+ if the user did not attend the event
   def attended_event? event
     event_registration = event.events_registrations.find_by(registration: self.registrations)
 
@@ -192,4 +186,13 @@ class User < ActiveRecord::Base
       self.is_admin = true
     end
   end
+
+  ##
+  # Check if biography has an allowed number of words. Used as validation.
+  #
+  def check_biography_length
+    if self.biography.present?
+      errors.add(:biography, 'is limited to 150 words.') unless self.biography.split.length <= 150
+    end
+  end
 end

spec/models/user_spec.rb

@@ -71,6 +71,31 @@ describe User do
       end
     end
 
+    describe '#check_biography_length' do
+      it 'biography can not have more than 150 words' do
+        # Text with 151 words
+        long_text = <<-EOS
+          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean
+          vestibulum, augue ut accumsan feugiat, mauris eros accumsan nunc,
+          volutpat vulputate eros orci quis nulla. Cum sociis natoque penatibus
+          et magnis dis parturient montes, nascetur ridiculus mus. Sed varius
+          orci ut lectus convallis, et ultrices ex finibus. Praesent orci augue,
+          aliquet at cursus at, placerat id ligula. Vestibulum a mauris non
+          felis pretium laoreet. Cras vel nisl convallis, pharetra ipsum at,
+          mattis erat. Praesent in lectus felis. Fusce eros mauris, euismod
+          lobortis metus id, tristique scelerisque nisl. Suspendisse potenti.
+          Suspendisse ac metus magna. Integer lobortis pharetra eros euismod
+          fringilla. Phasellus vitae orci vel magna laoreet mattis non eu neque.
+          Mauris ac dictum leo. Nullam dapibus convallis molestie. Integer
+          dignissim massa at odio feugiat tempus. Pellentesque ultrices rutrum
+          eros, a pellentesque lorem auctor in. Suspendisse sollicitudin dolor
+          vitae justo dignissim, a condimentum turpis molestie. Aenean
+          scelerisque, arcu eu congue mollis, nibh nulla finibus.
+        EOS
+        expect{create(:user, biography: long_text)}.to_not change { User.count }
+      end
+    end
+
     describe '#subscribed?' do
       context 'user has subscribed to conference' do
         before { create(:subscription, user: user, conference: conference) }